1
2
3
4
5
6
7
8
9
10
11
12
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
1
2
3
4
5
6
7
8
9
10
11
12
YDP-323
YDP-323
YDP-323
<Page. 2>
28CC1-8834455
7
Detection Voltage
Boot Mode when SW1 is ON.
Details of &&&.
No: not installed
R80
No
R81
0
Ω
R92
4.7k
R93
4.7k
C96
10/16
C98
No
C149
0.01u
C81
No
R74
No
28CC1-8835084
28CC1-8834937
1
DAMPER pedal
IN
OUT
MIDI
PEDAL
SOSTENUTO pedal
SOFT pedal
CN1
NC
SYSTEM
RESET
CPU
AND
OP AMP
MASK ROM 64M
PROG./WAVE 2
DAC
BUFFER
REG5V
REGULATOR
+3.3V / +2.5V
INVERTER
MASK ROM 64M
PROG./WAVE 1
FLASH ROM 4M
DRAM 4M
not installed
not installed
not installed
not installed
not installed
not installed
not installed
: Not installed
: Ceramic Capacitor
Note : See parts list for details of circuit board component parts.
NJM78M05DL1A(X0673A00)
REG5V
DM: IC10
1: INPUT
2: GND
3: OUTPUT
1
2
3
µ
PC37M32TJ-E1-AZ(X5914A00)
REG3.3V/+2.5V
DM: IC5
1: INPUT
2: NC
3: GND
4: OUTPUT1
5: OUTPUT2
6: GND(Fin)
1
2
3 4
5
6
EC10DS4-TE12L (VN681100)
DIODE
DM: D1-3
1
2
1: ANODE
2: CATHODE
D1F60 (VS201100)
DIODE
DM: D1-3
1: ANODE
2: CATHODE
2
1
DTC123JKA (VY677600)
DIGITAL TRANSISTOR
DM : TR5
1: GND
2: IN
3: OUT
1
3
2
OUT
R1
R2
GND
IN
IN
GND
OUT
UMG5N (WC668500)
DIGITAL TRANSISTOR
DM : TA1
1: DTr1 IN
2: GND
3: DTr2 IN
4: DTr2 OUT
5: DTr1 OUT
1
3
4
5
2
R1
DTr1
DTr2
R2
R1
R2
3
4
5
2
1
R1: 10k
Ω
R2: 47k
Ω
not installed
PHOTO COUPLER
KEY MATRIX
SW [0]
SW [1]
SW [2]
SW [3]
SW [4]
SW [5]
+5D
PANEL: SW1
DEMO/SONG
PANEL: SW2
PIANO/VOICE
PANEL: SW3
SELECT
PANEL: SW4
REC
PANEL: SW5
PLAY
PANEL: SW6
METRONOME
LED MATRIX
LD [0]
LD [1]
+5D
PANEL: LD1
REC
PANEL: LD2
PLAY
1SS133,1SS176,HSS104
(VD631600)
DIODE
DJACK: D1–7
1
2
1: ANODE
2: CATHODE
■
YDP-323 OVERALL CIRCUIT DIAGRAM 1/2 (DJACK, DM, PANEL, PEDAL)